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中空纤维Silicalite-1分子筛膜用于轻石脑油中烷烃的分离

作者：孙耀璋¹，吕舒远¹，张春¹，李金芝²，胡锐¹，于中伟²，顾学红¹

单位： 1. 南京工业大学化工学院材料化学工程国家重点实验室，南京 211800; 2. 中石化石油化工科学研究院有限公司，北京 100083

关键词：中空纤维； Silicalite-1分子筛膜；轻石脑油；蒸汽渗透；烷烃分离

DOI号： 10.16159/j.cnki.issn1007-8924.2025.02.013

分类号： TQ028.1

出版年,卷(期):页码： 2025,45(2):109-116

摘要：

轻石脑油中富含C5、C6烷烃，开发高效节能的分离技术将正、异构体分开，实现工业产品的物尽其用是人们关注的焦点。本文在四通道中空纤维载体上制备了Silicalite-1（全硅型MFI）分子筛膜，并将其用于C5、C6烷烃正异构体的分离，考察了温度、压力等操作条件对所制备分子筛膜性能的影响。结果表明，对于正戊烷/异戊烷（n-/i-C5）二元体系的分离，在80 ℃，原料分压为5 kPa时，n-C5渗透性为1.12×10-7 mol/(m2·s·Pa)，n-/i-C5分离因子可达109；对于正己烷/三甲基戊烷/二甲基戊烷（n-C6/3MP/2MP）三元体系的分离，在80 ℃，原料分压为5 kPa时，n-C6的渗透性为1.83×10-7 mol/(m2·s·Pa），n-/i-C6分离因子高达132。同时，评价了较高进料分压下所制备膜材料在分离体系中的运行稳定性，均可稳定操作60 h以上。该研究结果将为石化行业的技术革新升级奠定基础。

Light naphtha is rich in C5 and C6 alkanes, so it is focused to develop the efficient and energy-saving technologies of separating n-alkane and i-alkanes. It will be helpful to realize the best use of industrial product. In this paper, Silicalite-1 (all-silica MFI) zeolite membranes were prepared on four-channel hollow fiber substrates and used for the separation of C5 or C6 alkane mixtures. Besides, the effects of operating conditions such as temperature and pressure on the performance of the prepared zeolite membranes were investigated. For the separation of n-pentane/isopentane (n-/i-C5) binary mixture, a n-C5 permeance of 1.12×10-7 mol/(m2·s·Pa) and the n-/i-C5 separation factor of 109 were achieved at 80 ℃ and the feed partial pressure of 5 kPa. For the separation of n-hexane/trimethylpentane/dimethylpentane (n-C6/3MP/2MP) ternary mixture at 80 ℃ and the 5 kPa feed partial pressure, the membrane showed a n-C6 permeance of 1.83×10-7 mol/(m2·s·Pa） and a n-/i-C6 separation factor of 132. At the same time, the operation stability under high feed partial pressure was evaluated. And the long-term stable operation can last more than 60 h. The results of this study will lay a foundation for technological innovation and upgrading in the petrochemical industry.

基金项目：

中国石油化工股份有限公司委托项目（124056）

作者简介：

孙耀璋（2001-），男，甘肃陇西人，硕士研究生，主要研究方向为分子筛膜的制备及应用

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